单项选择题


A．involve
B．involving
C．to involve
D．involved
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单项选择题
A．HelpingB．HelpC．HelpedD．To help
A．Helping
B．Help
C．Helped
D．To help
单项选择题
A．performB．serveC．functionD．progress
A．perform
B．serve
C．function
D．progress
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